Acid + Metal → Salt + X What is X in the equation?

Acid + Metal → Salt + X When an acid reacts with metal, a metal salt and hydrogen gas are produced. Hence, the X in the equation is hydrogen gas. The general word reaction equation for this type of reaction can be written as follows: Acid + Metal → Salt + Hydrogen gas Example: Zn Zinc + 2 HCl Hydrochloric acid → ZnCl 2 Zinc chloride + H 2 ↑ Hydrogen gas

The following table lists the pH values of some substances. Solution pH Hydrochloric acid 1 Milk 6 Pure water 7 Baking soda 9 Sodium hydroxide 14 What would happen to the pH of an acid and a base when each is diluted (pure distilled water is added to it)?

When pure distilled water is added to the acid then the pH value of the acid increases and the acid becomes dilute i.e solution becomes less acidic. In the case of base pH value decreases and basic strength decreases i.e it becomes less basic solution.

The pH of three solutions is given in the table. Answer the questions that follow. Solution pH P 1 Q 7 R 14 Which of these solutions could possibly react with zinc metal to produce hydrogen gas?

Generally, a metal reacts with an acid to produce salt and hydrogen gas. When zinc metal reacts with strong acids like hydrochloric acid which has pH value nearly 1 , zinc chloride and hydrogen gas are formed. The reaction is shown below. Zn s + 2 HCl aq → ZnCl 2 aq + H 2 g Bases react with amphoteric metals to liberate hydrogen gas. Zinc reacts with strong base like sodium hydroxide (pH = 14 ) to form sodium zincate and hydrogen gas. The reaction is: Zn + 2 NaOH → Na 2 ZnO 2 + H 2 Hence, P and R solution which has pH 1 and 14 respectively can react with zinc.

The pH of three solutions is given in the table. Answer the questions that follow. Solution pH P 1 Q 7 R 14 Which of these solutions could be formed by the reaction of a metal oxide with water?

Metal oxides when dissolved in water forms a basic solution. The pH value of solution with pH 14 is basic in nature. Hence, solution R could be formed by the reaction of a metal oxide with water.

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Important Questions on Acids, Bases and Salts

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Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 5

Mike placed an electric circuit separately in a dilute acid and a dilute base.

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Mike observed whether the lamp in the circuit glowed for each liquid.

Which property of acids and bases was Mike trying to test through his experiment?

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Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 6

Mike placed an electric circuit separately in a dilute acid and a dilute base.

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Mike observed whether the lamp in the circuit glowed for each liquid.

Will the lamp glow if the circuit is placed in distilled water? Explain your answer.

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Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 7

$Acid + Metal \to Salt + X$

What is $X$ in the equation?

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Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 8

Adding which of the following to a colourless solution would give an indication that the solution could possibly be hydrochloric acid?

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Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 9

Which of these graphs shows how the pH of milk changes as it forms curd?

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Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 10

The following table lists the pH values of some substances.

Solution	pH
Hydrochloric acid	1
Milk	6
Pure water	7
Baking soda	9
Sodium hydroxide	14

What would happen to the pH of an acid and a base when each is diluted (pure distilled water is added to it)?

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Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 11

The pH of three solutions is given in the table. Answer the questions that follow.

Solution	pH
P	$1$
Q	$7$
R	$14$

Which of these solutions could possibly react with zinc metal to produce hydrogen gas?

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Science Textbook of Competency Based Questions for Class X>Chapter 2 - Acids, Bases and Salts>Exercise>Q 12

The pH of three solutions is given in the table. Answer the questions that follow.

Solution	pH
P	$1$
Q	$7$
R	$14$

Which of these solutions could be formed by the reaction of a metal oxide with water?

Builders use plaster of Paris to make the surface layer of the inner walls of a building. Which property of plaster of Paris powder makes it a suitable building material?

Important Questions on Acids, Bases and Salts

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Builders use plaster of Paris to make the surface layer of the inner walls of a building.

Which property of plaster of Paris powder makes it a suitable building material?